MESON Chess Problem Database

Problem Display
PID: 135531 (4B3/8/1p6/kp6/1p6/8/8/1K1Q4 w - - 0 1)

Ekstrom, Sven Johan Adrian

Polistidningen, 1946

4B3/8/1p6/kp6/1p6/8/8/1K1Q4

#2

3 + 4

145 StrateGems 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Tries
    • 1.Qe2?
      • threat
        • 2.Qxb5#
        • 2.Qa2#
      • 1...Ka4
        • 2.Qa2#
      • 1...b3
        • 2.Qxb5#
      • 1...Ka6!
    • 1.Qd2?
      • threat
        • 2.Qa2#
      • 1...Ka4
        • 2.Qa2#
      • 1...Ka6!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qa2#
        • 2.Qa8#
        • 2.Qxb5#
      • 1...Ka4
        • 2.Qa2#
      • 1...Ka6
        • 2.Qa8#
      • 1...b3
        • 2.Qxb5#

This anticipates 109550(1987), 7941(1994)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAR2(B)
        • P(a);::QAR1(B),XP(c)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(B);P_PINP(a)
      • Threat
        • QAR(B)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT,P_SPINP(c)::QAR2(B)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
  • Actual
    • Q(B);P_PINP(c)
    • Threat
      • DUALS(3)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • K(b);N_SPINP(c),P-FLIGHT::QAR2(B)
      • P(a);::QAR1(B),XP(c)
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